html {
    font-family: sans-serif;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {/*统一默认字体及大小、颜色*/
    margin: 0;
    font-family: "微软雅黑";
    font-size: 14px;
    color: #333;
}

footer{
    margin: 50px 0 0;
    padding: 20px 0;
    width: 100%;
    height: 60px;
    background-color: #333;
}

.wrapper{
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    justify-content: center;
}